Post #346 MonDak Heritage Center Share: ArtsNon-Profit Organization MonDak Heritage Center Visit Website Request Info 120 3rd Ave. SE Sidney, MT 59270 (406) 433-3500 (406) 433-3503 (fax) Hours: Tues-Fri: 10-4, Sat. 1-4 About Map About The MonDak Heritage Center is the Bakken region's premier museum. Our mission is to engage, educate and inspire our community. Directions At the corner of 3rd Ave SE and 2nd St SE What's Nearby? Distance: 5 10 15 20 25 50 mi.